Patents by Inventor Hiroshi Take

Hiroshi Take has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12164185
    Abstract: To provide an optical modulation element whereby reduced drive voltage and suppression of DC drift can be obtained at the same time. An optical modulation element includes: a substrate; and an optical waveguide formed of an electrooptic material film formed on the substrate and having a ridge part which is a protruding portion, and a slab part having a smaller film thickness than the ridge part 11r. The optical waveguide includes a first waveguide part having a first ridge width and a first slab film thickness and to which an RF signal is applied, and a second waveguide part having a second ridge width and a second slab film thickness different from the first slab film thickness and to which a DC bias is applied.
    Type: Grant
    Filed: January 20, 2021
    Date of Patent: December 10, 2024
    Assignee: TDK Corporation
    Inventors: Anthony Reymund Melad Binarao, Cheng Bu Heng, Hiroshi Take, Kenji Nagase, Shinji Iwatsuka, Hiroki Hara
  • Publication number: 20240377696
    Abstract: An optical device, including a substrate and a plurality of optical waveguide paths formed on the substrate and having slab portions with different thicknesses.
    Type: Application
    Filed: September 28, 2022
    Publication date: November 14, 2024
    Applicant: TDK CORPORATION
    Inventors: Hiroshi TAKE, Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
  • Publication number: 20240329307
    Abstract: An optical device includes: a substrate; and at least two optical waveguides formed on the substrate and facing a multiplexed portion on the substrate in a light propagation direction, wherein in a cross section perpendicular to the light propagation direction, an angle formed between the substrate and a side surface of one optical waveguide, which faces the other optical waveguides, is set to ?, and an angle formed between the substrate and a side surface of one optical waveguide, which does not face the other optical waveguides, is set to ?, satisfying ?<?, wherein ??90°, and ??90°. Therefore, light propagating through the at least two optical waveguides tends to propagate between the optical waveguides when approaching the multiplexed portion. As a result, the light transmission loss during multiplexing light can be reduced.
    Type: Application
    Filed: March 28, 2024
    Publication date: October 3, 2024
    Applicant: TDK Corporation
    Inventors: Hiroshi TAKE, Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
  • Publication number: 20240329306
    Abstract: An optical device includes: a substrate having a pair of main surfaces opposite each other in a first direction and an end surface adjacent to the main surface, and an optical waveguide formed on the substrate and having a light incident surface or a light exit surface in a direction of a plane where the end surface is located, where at least a central portion of the light incident surface and/or light exit surface of the optical waveguide includes an inclined surface having a preset angle with respect to the end surface of the substrate.
    Type: Application
    Filed: March 28, 2024
    Publication date: October 3, 2024
    Applicant: TDK CORPORATION
    Inventors: Shuntaro KODAMA, Hiroshi TAKE, Kenji NAGASE, Ryohei FUKUZAKI
  • Publication number: 20240329316
    Abstract: An optical device includes: a substrate; and at least two optical waveguides formed on the substrate and facing to a multiplexed portion on the substrate in a light propagation direction, the optical waveguide includes a lamellar portion and a protruding portion which protrudes from the lamellar portion, in a cross section perpendicular to the light propagation direction, the thickness of the lamellar portion between the protruding portions of the at least two optical waveguides is greater than the thickness of the lamellar portion at the side of a side surface of the protruding portion of the optical waveguides, which does not face to other optical waveguides. Thereby, the transmission loss of light during multiplexing light can be reduced.
    Type: Application
    Filed: March 28, 2024
    Publication date: October 3, 2024
    Applicant: TDK CORPORATION
    Inventors: Hiroshi Take, Kenji Nagase, Anthony Reymund Melad Binarao, Cheng Bu Heng
  • Publication number: 20240329340
    Abstract: An optical device includes: a substrate having a pair of main surfaces opposite each other in a first direction, end surfaces adjacent to the main surfaces, and a pair of side surfaces, and an optical waveguide, disposed along the main surface of the substrate and having a light incidence end or a light exit end in the direction of a plane where the end surface is located, wherein, an adhesive for connection is coated on the end surface of the substrate, and at least one stepped portion is formed between the optical waveguide and the adhesive.
    Type: Application
    Filed: March 28, 2024
    Publication date: October 3, 2024
    Applicant: TDK CORPORATION
    Inventors: Kenji NAGASE, Hiroshi TAKE, Shuntaro KODAMA, Ryohei FUKUZAKI
  • Patent number: 12085791
    Abstract: An optical waveguide element includes: an optical waveguide having a ridge part and a slab part having a thickness less than the ridge part. The optical waveguide includes: a first waveguide having a first ridge with and a first slab film thickness; a second waveguide having a second ridge width and a second slab film thickness; a first intermediate waveguide connected to the first waveguide and having a third ridge width and the first slab film thickness; and a second intermediate waveguide connected to the second waveguide and having a fourth ridge width and the second slab film thickness. The first waveguide, the first intermediate waveguide, the second intermediate waveguide, and the second waveguide are arranged in this order; the second slab film thickness is larger than the first slab film thickness; and the third ridge width is larger than the fourth ridge width.
    Type: Grant
    Filed: January 20, 2021
    Date of Patent: September 10, 2024
    Assignee: TDK CORPORATION
    Inventors: Shinji Iwatsuka, Hiroki Hara, Anthony Reymund Melad Binarao, Cheng Bu Heng, Hiroshi Take, Kenji Nagase
  • Patent number: 11947147
    Abstract: An optical device including: a substrate; an optical waveguide formed at the substrate; and a protective layer formed adjacent to the optical waveguide, wherein the optical waveguide includes multiple side surfaces that intersect the substrate, at least one side surface of the optical waveguide is provided with a rough surface. According to the optical device of the present invention, the light propagation loss can be reduced.
    Type: Grant
    Filed: March 29, 2022
    Date of Patent: April 2, 2024
    Assignee: TDK CORPORATION
    Inventors: Kenji Nagase, Hiroshi Take, Anthony Reymund Melad Binarao, Cheng Bu Heng
  • Publication number: 20230375781
    Abstract: An electro-optic device which is provided with: a substrate, an optical waveguide formed on the substrate, and an upper electrode formed on the optical waveguide. The electro-optic device is further provided with a buffer layer formed between the substrate and the upper electrode, and a boundary portion of the optical waveguide and the buffer layer forms an oxide layer different from the optical waveguide and the buffer layer in composition.
    Type: Application
    Filed: September 29, 2021
    Publication date: November 23, 2023
    Applicant: TDK CORPORATION
    Inventors: Hiroshi TAKE, Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
  • Publication number: 20230333417
    Abstract: An optical modulator, including: a substrate; a plurality of electro-optic material layers formed on the substrate; and an electrode formed on the electro-optic material layer; wherein the electro-optic material layer has a patterned RF portion waveguide that applies a modulated signal and a patterned DC portion waveguide that applies a direct current bias signal; and on a section perpendicular to a light propagation direction, the sectional area of the DC portion waveguide is greater than the sectional area of the RF portion waveguide.
    Type: Application
    Filed: September 29, 2021
    Publication date: October 19, 2023
    Applicant: TDK CORPORATION
    Inventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
  • Publication number: 20230314852
    Abstract: An optical device, including a substrate; an optical waveguide provided in a predetermined region of the substrate and formed of an electro-optic material film; a protective layer formed adjacent to the optical waveguide; and a non-light-propagation optical waveguide provided outside the predetermined region, wherein the surface roughness of the non-light-propagation optical waveguide is RMS 0.5 nm or more. According to the optical device, the occurrence of micro-cracks on the optical waveguide can be suppressed, thereby reducing the light propagation loss.
    Type: Application
    Filed: March 27, 2023
    Publication date: October 5, 2023
    Applicant: TDK CORPORATION
    Inventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
  • Publication number: 20230314710
    Abstract: The present invention provides an optical device and an optical modulator, the optical device comprises an optical waveguide, at an surface of plate-like or film-like electro-optic material forming the optical waveguide, 3 locations are selected in the extension direction of the optical waveguide, and 2 locations are selected in the width direction of the optical waveguide in a range of a region of 0.1×0.1 ?m, and for a total of 6 locations, an surface roughness RMS is measured with Atomic Force Microscope, and an average of the RMS is 5.1 nm or less. According to the optical device in the present invention, the occurrence of micro-cracks at the optical waveguide can be suppressed, thereby reducing the light propagation loss.
    Type: Application
    Filed: March 28, 2023
    Publication date: October 5, 2023
    Applicant: TDK CORPORATION
    Inventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
  • Publication number: 20230296929
    Abstract: An optical modulation element is provided with a substrate, a waveguide layer formed on the substrate, a dielectric layer formed on the waveguide layer, and an electrode formed on the dielectric layer. An outer peripheral end portion of the dielectric layer has an offset area positioned inside an outer peripheral end portion of the substrate. In at least a part of the offset area, a distance from the outer peripheral end portion of the substrate to the outer peripheral end portion of the dielectric layer is equal to or less than a distance from the outer peripheral end portion of the substrate to the outer peripheral end portion of the electrode.
    Type: Application
    Filed: February 6, 2023
    Publication date: September 21, 2023
    Inventors: Hiroki HARA, Takashi KIKUKAWA, Hiroshi TAKE, Kenji NAGASE, Shuntaro KODAMA
  • Publication number: 20230124507
    Abstract: An electro-optical device includes an optical waveguide and an upper electrode provided on the optical waveguide, the optical waveguide is formed by turning back on a plane, the upper electrode has adjacent parts by turning back the optical waveguide, and an upper layer higher than the upper electrode between the adjacent parts includes a metal layer. Alternatively, an electro-optic device includes a plurality of Mach-Zehnder optical waveguides, wherein the Mach-Zehnder optical waveguide includes a first optical waveguide and a second optical waveguide, a first upper electrode is provided on the first optical waveguide and a second upper electrode is provided on the second optical waveguide, and an upper layer higher than the first upper electrode and the second upper electrode between the first upper electrode and the second upper electrode includes a metal layer. An electro-optic device is capable of suppressing electrical crosstalk between components and seeking wide frequency band.
    Type: Application
    Filed: March 31, 2021
    Publication date: April 20, 2023
    Applicant: TDK CORPORATION
    Inventors: Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG, Hiroshi TAKE
  • Publication number: 20230122741
    Abstract: An optical modulators is disclosed. The optical modulator includes a substrate, an optical waveguide formed on the substrate, a signal electrode formed on the optical waveguide via a first buffer layer and applying a modulation signal to the optical waveguide, and a bias electrode formed on the optical waveguide via a second buffer layer and applying a DC bias to the optical waveguide, the first buffer layer and the second buffer layer are formed in such a way that either one of the first buffer layer and the second buffer layer covers an end surface of the other one of the first buffer layer and the second buffer layer at a boundary part of the first buffer layer and the second buffer layer. Accordingly, an optical modulator with high reliability can be provided.
    Type: Application
    Filed: March 31, 2021
    Publication date: April 20, 2023
    Applicant: TDK CORPORATION
    Inventors: Hiroshi TAKE, Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
  • Publication number: 20230115362
    Abstract: An electro-optical device, including: a substrate; an optical waveguide composed of an electro-optic material film formed in a ridge shape on the substrate; a buffer layer configured to cover the optical waveguide; and an upper electrode provided on the optical waveguide through the buffer layer, and the buffer layer has a recess on the upper electrode side above the optical waveguide. Accordingly, the propagation loss of light can be suppressed.
    Type: Application
    Filed: March 31, 2021
    Publication date: April 13, 2023
    Applicant: TDK CORPORATION
    Inventors: Kenji NAGASE, Hiroshi TAKE, Shingo MIYATA
  • Publication number: 20230112785
    Abstract: An electro-optical device, including: a substrate; an optical waveguide film formed of electro-optical material provided in a predetermined region on the substrate; a buffer layer provided adjacent to the optical waveguide film; and an electrode for applying an electric field to the optical waveguide film, and a non-light-transmission optical waveguide film is provided outside the predetermined region. According to the electro-optical device of the present disclosure, the propagation loss of light can be suppressed.
    Type: Application
    Filed: March 31, 2021
    Publication date: April 13, 2023
    Applicant: TDK CORPORATION
    Inventors: Kenji NAGASE, Hiroshi TAKE
  • Publication number: 20230069468
    Abstract: An optical waveguide element includes: an optical waveguide having a ridge part and a slab part having a thickness less than the ridge part. The optical waveguide includes: a first waveguide having a first ridge with and a first slab film thickness; a second waveguide having a second ridge width and a second slab film thickness; a first intermediate waveguide connected to the first waveguide and having a third ridge width and the first slab film thickness; and a second intermediate waveguide connected to the second waveguide and having a fourth ridge width and the second slab film thickness. The first waveguide, the first intermediate waveguide, the second intermediate waveguide, and the second waveguide are arranged in this order; the second slab film thickness is larger than the first slab film thickness; and the third ridge width is larger than the fourth ridge width.
    Type: Application
    Filed: January 20, 2021
    Publication date: March 2, 2023
    Inventors: Shinji Iwatsuka, Hiroki HARA, Anthony Reymund Melad BINARAO, Cheng Bu HENG, Hiroshi TAKE, Kenji NAGASE
  • Publication number: 20230057036
    Abstract: To provide an optical modulation element whereby reduced drive voltage and suppression of DC drift can be obtained at the same time. An optical modulation element includes: a substrate; and an optical waveguide formed of an electrooptic material film formed on the substrate and having a ridge part which is a protruding portion, and a slab part having a smaller film thickness than the ridge part 11r. The optical waveguide includes a first waveguide part having a first ridge width and a first slab film thickness and to which an RF signal is applied, and a second waveguide part having a second ridge width and a second slab film thickness different from the first slab film thickness and to which a DC bias is applied.
    Type: Application
    Filed: January 20, 2021
    Publication date: February 23, 2023
    Inventors: Anthony Reymund Melad Binarao, Cheng Bu HENG, Hiroshi TAKE, Kenji NAGASE, Shinji IWATSUKA, Hiroki HARA
  • Publication number: 20230036811
    Abstract: The invention relates to an optical modulator. The optical modulator comprising: a substrate; an electro-optical material layer formed on a predetermined region of the substrate; a buffer layer formed on the substrate which is provided so as to cover the electro-optical material layer; and an electrode formed on the buffer layer, and the electro-optical material layer has a RF portion optical waveguide which is applied with a modulation signal and is patterned, and a DC portion optical waveguide which is applied with a DC voltage and is patterned, the electrode has an RF portion electrode formed on the buffer layer where the RF portion optical waveguide is located and a DC portion electrode formed on the buffer layer where the DC portion optical waveguide is located, the film thickness of the DC portion electrode is smaller than the film thickness of the RF portion electrode.
    Type: Application
    Filed: April 8, 2022
    Publication date: February 2, 2023
    Applicant: TDK CORPORATION
    Inventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG